References ▼
#include "ltwrappr.h"
L_INT LTwain::GetJPEGCompression (pTwJpegComp, uFlag);
Gets the current or default JPEG compression settings for the session.
Pointer to a TW_JPEGCOMPRESSION structure to be updated with the JPEG compression settings.
Flag that indicates which type of JPEG compression values to get. Possible values are:
| Value | Meaning |
|---|---|
| LTWAIN_GET_JPEG_COMPRESSION | [0x0001] Get the current JPEG compression settings. |
| LTWAIN_GET_DEFAULT_JPEG_COMPRESSION | [0x0002] Get the default JPEG compression settings. |
| Value | Meaning |
|---|---|
| SUCCESS | The function was successful. |
| < 1 | An error occurred. Refer to Return Codes. |
This function will get the current or default TWAIN JPEG compression settings, depending on the flag passed to the uFlag parameter.
For more information about TW_JPEGCOMPRESSION, refer to the TWAIN specification.
Required DLLs and Libraries
L_INT LTwain__GetJPEGCompressionExample(LTwain * plTwain){L_INT nRet;TW_JPEGCOMPRESSION myJPEG;memset(&myJPEG, 0, sizeof(TW_JPEGCOMPRESSION));nRet = plTwain->GetJPEGCompression(&myJPEG, LTWAIN_GET_JPEG_COMPRESSION);if (nRet == SUCCESS){myJPEG.ColorSpace = TWPT_GRAY;myJPEG.SubSampling = 0x10001000;myJPEG.NumComponents = 1;myJPEG.RestartFrequency = 0;myJPEG.QuantMap[0] = 0;memset(&myJPEG.QuantTable[0], 0, sizeof(TW_MEMORY));myJPEG.HuffmanMap[0] = 0;memset(&myJPEG.HuffmanDC[0], 0, sizeof(TW_MEMORY));memset(&myJPEG.HuffmanAC[0], 0, sizeof(TW_MEMORY));nRet = plTwain->SetJPEGCompression (&myJPEG, LTWAIN_SET_JPEG_COMPRESSION);if (nRet == SUCCESS)MessageBox(NULL, TEXT("Set JPEG compression options is success"), TEXT("Notice!"), MB_OK);elsereturn nRet;}elsereturn nRet;return SUCCESS;}